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Subject[PATCH v3 0/8] arm64: IRQ priority masking and Pseudo-NMI fixes
Date
Version one[1] of this series attempted to fix the issue reported by
Zenghui[2] when using the function_graph tracer with IRQ priority
masking.

Since then, I realized that priority masking and the use of Pseudo-NMIs
was more broken than I thought.

* Patch 1-2 are just some cleanup
* Patch 3 fixes a potential issue with not clobbering condition flags
in irqflags operations
* Patch 4 fixes an issue where calling C code in Pseudo-NMI before
entering NMI enter could lead to potential races
* Patch 5 fixes the function_graph issue when using priority masking
* Patch 6 introduces some debug to hopefully avoid breaking things in
the future
* Patch 7 is a rebased version of the patch sent by Wei Li[3] fixing
an error that can happen during on some platform using the priority
masking feature
* Patch 8 re-enables the Pseudo-NMI selection

Changes since V2 [4]:
- Rebase on v5.2-rc3
- clobber conditions flags for asm that needs it as pointed out by Marc Z.
and Robin M.
- Fix the naming of the new PMR bit value
- Introduce some helper for the debug conditions
- use WARN_ONCE for debug that might be very noisy
- Reenable pseudo NMI.

Changes since V1 [1]:
- Fix possible race condition between NMI and trace irqflags
- Simplify the representation of PSR.I in the PMR value
- Include Wei Li's fix
- Rebase on v5.1-rc7

[1] https://marc.info/?l=linux-arm-kernel&m=155542458004480&w=2
[2] https://www.spinics.net/lists/arm-kernel/msg716956.html
[3] https://www.spinics.net/lists/arm-kernel/msg722171.html
[4] https://lkml.org/lkml/2019/4/29/643

Cheers,

Julien

-->

Julien Thierry (7):
arm64: Do not enable IRQs for ct_user_exit
arm64: irqflags: Pass flags as readonly operand to restore instruction
arm64: irqflags: Add condition flags to inline asm clobber list
arm64: Fix interrupt tracing in the presence of NMIs
arm64: Fix incorrect irqflag restore for priority masking
arm64: irqflags: Introduce explicit debugging for IRQ priorities
arm64: Allow selecting Pseudo-NMI again

Wei Li (1):
arm64: fix kernel stack overflow in kdump capture kernel

arch/arm64/Kconfig | 12 +++++-
arch/arm64/include/asm/arch_gicv3.h | 4 +-
arch/arm64/include/asm/cpufeature.h | 6 +++
arch/arm64/include/asm/daifflags.h | 75 +++++++++++++++++++++------------
arch/arm64/include/asm/irqflags.h | 79 +++++++++++++++++-----------------
arch/arm64/include/asm/kvm_host.h | 7 ++--
arch/arm64/include/asm/ptrace.h | 10 ++++-
arch/arm64/kernel/entry.S | 84 +++++++++++++++++++++++++++++--------
arch/arm64/kernel/irq.c | 26 ++++++++++++
arch/arm64/kernel/process.c | 2 +-
arch/arm64/kernel/smp.c | 6 +--
arch/arm64/kvm/hyp/switch.c | 2 +-
drivers/irqchip/irq-gic-v3.c | 6 +++
kernel/irq/irqdesc.c | 8 +++-
14 files changed, 227 insertions(+), 100 deletions(-)

--
1.9.1

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